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    BEARING STEEL COMPONENT, AND STEEL BAR FOR BEARING STEEL COMPONENT
    2.
    发明公开
    BEARING STEEL COMPONENT, AND STEEL BAR FOR BEARING STEEL COMPONENT 审中-公开

    公开(公告)号：EP3744867A1

    公开(公告)日：2020-12-02

    申请号：EP19741894.0

    申请日：2019-01-22

    申请人： NIPPON STEEL CORPORATION

    发明人： KOYAMA, Tatsuya ,  MIYANISHI, Kei ,  NEISHI, Yutaka

    IPC分类号： C22C38/00 ,  C22C38/60 ,  C21D7/06

    摘要： A bearing steel part having a predetermined chemical composition, in which the number density of oxide particles having an equivalent circle diameter of 5 µm or more, and containing CaO, Al 2 O 3 and SiO 2 , such that the content ratio of Al 2 O 3 with respect to the total mass of CaO, Al 2 O 3 , and SiO 2 is 50% by mass or more, is 3.0/cm 2 or less in an arbitrary cross section of the part, and in which the Vickers hardness at a depth of 50 µm from a rolling surface is 750 or more, and in which the compressive residual stress at the rolling surface is 900 MPa or more. Also provided is a steel bar for a bearing steel part that is suitable for obtaining the foregoing bearing steel part.

    STEEL MATERIAL FOR CARBURIZED BEARING COMPONENT
    4.
    发明公开
    STEEL MATERIAL FOR CARBURIZED BEARING COMPONENT 审中-公开

    公开(公告)号：EP3677699A1

    公开(公告)日：2020-07-08

    申请号：EP18849045.2

    申请日：2018-08-24

    申请人： Nippon Steel Corporation ,  JTEKT Corporation

    发明人： YAMASHITA, Tomohiro ,  SUZUKI, Takahisa ,  NEISHI, Yutaka ,  HIRAKAMI, Daisuke ,  KANETANI, Kohei ,  SADA, Takashi

    IPC分类号： C22C38/00 ,  C21D1/06 ,  C22C38/54 ,  C23C8/22

    摘要： A steel material for a carburized bearing part is provided that is excellent in toughness, surface initiated spalling life and wear resistance. The steel material for a carburized bearing part according to the present invention contains, by mass%, C: 0.25 to 0.45%, Si: 0.15 to 0.45%, Mn: 0.40 to 1.50%, P: 0.015% or less, S: 0.005% or less, Cr: 0.60 to 2.00%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.100%, Ca: 0.0002 to 0.0010%, N: 0.0300% or less and O: 0.0015% or less, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). 1.20 0.4 Cr + 0.4 Mo + 4.5 V 2.75 A 1 / A 2 > 0.50 2.7 C + 0.4 Si + Mn + 0.45 Ni + 0.8 Cr + Mo + V > 2.55 Formula (2) shows an area fraction of sulfides containing Ca in an amount of 1 mol% or more among sulfides having an equivalent circular diameter of 1 µm or more.

    STEEL MATERIAL FOR STEEL PISTONS
    6.
    发明公开
    STEEL MATERIAL FOR STEEL PISTONS 审中-公开

    公开(公告)号：EP3805418A1

    公开(公告)日：2021-04-14

    申请号：EP19811849.9

    申请日：2019-05-31

    申请人： NIPPON STEEL CORPORATION

    发明人： NEISHI, Yutaka

    IPC分类号： C22C38/00 ,  C22C38/48 ,  C21C7/00 ,  C21C7/04 ,  C21C7/10 ,  C21D8/06 ,  C21D9/00

    摘要： A steel material for a steel piston that is suitable for use in a steel piston is provided. A steel material for a steel piston according to this embodiment has a chemical composition which consists of, in mass%, C: 0.15 to 0.30%, Si: 0.02 to 1.00%, Mn: 0.20 to 0.80%, P: 0.020% or less, S: 0.028% or less, Cr: 0.80 to 1.50%, Mo: 0.08 to 0.40%, V: 0.10 to 0.40%, Al: 0.005 to 0.060%, N: 0.0150% or less, O: 0.0030% or less, and the balance: Fe and impurities, and satisfies Formula (1) and Formula (2), in which, at a cross section parallel to the axial direction of the steel material for a steel piston, the number of Mn sulfides is 100.0 per mm 2 or less, the number of coarse Mn sulfides having an equivalent circular diameter of 3.0 µm or more is in a range of 1.0 to 10.0 per mm 2 , and the number of oxides is 15.0 per mm 2 or less. 0.42 ≤ Mo + 3 V ≤ 1.50 V / Mo ≥ 0.50